/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "gPCG.H"

#include "gSolvers.h"

namespace Foam
{
	defineTypeNameAndDebug(gPCG,0);

	lduMatrix::solver::addsymMatrixConstructorToTable<gPCG>
		addgPCGSymMatrixConstructorToTable_;

}

Foam::gPCG::gPCG
(
    const word& fieldName,
    const lduMatrix& matrix,
    const FieldField<Field, scalar>& interfaceBouCoeffs,
    const FieldField<Field, scalar>& interfaceIntCoeffs,
    const lduInterfaceFieldPtrsList& interfaces,
    const dictionary& solverControls
)
:
    lduMatrix::solver
    (
        fieldName,
        matrix,
        interfaceBouCoeffs,
        interfaceIntCoeffs,
        interfaces,
        solverControls
    )
{}

Foam::lduMatrix::solverPerformance Foam::gPCG::solve
(
    scalarField& psi,
    const scalarField& source,
    const direction cmpt
) const
{
    scalar initialResidual;
    scalar finalResidual;
    int nIterations = 0;
    bool converged = false;

    label rows = matrix_.diag().size();
    label nonZeroNumber= matrix_.lower().size() + matrix_.upper().size() + matrix_.diag().size();

	pcgsolve(rows, nonZeroNumber, 
			psi.data(),
			source.cdata(),
			matrix_.upper().size(),
			matrix_.lduAddr().upperAddr().cdata(),
			matrix_.lduAddr().lowerAddr().cdata(),
			matrix_.upper().cdata(),
			matrix_.lower().cdata(),
			matrix_.diag().cdata(),
			maxIter_,
			relTol_,
			tolerance_,
			initialResidual,
			finalResidual,
			nIterations,
			converged
			);
	
	// --- Setup class containing solver performance data
    lduMatrix::solverPerformance solverPerf
    (
        lduMatrix::preconditioner::getName(controlDict_) + typeName,
        fieldName_,
        initialResidual,
        finalResidual,
        nIterations,
        converged
    );

	return solverPerf;

}
